Wonder why your stomach still sticks out even though you’re hammering the core exercises every day? It's a common myth that bulging belly is due to weak abdominal muscles. The real cause is likely to be tight psoas muscles, which cause the lower back to curve pushing out the stomach. When the psoas works properly it pulls the abdomen back tucking the tummy in, giving you a strong, flat stomach.
As the body's "fight or flight" muscle, your psoas is deeply connected to our natural survival instinct. It instantly tightens in moments of danger to either protect you (in a fetal position) or help you run, fueled by the release of adrenaline. However, if your psoas is constantly tight, it signals to the body you are in constant danger, leading to overworking of the adrenal glands. When this happens, your immune system suffers and your body automatically switches into fat storing mode in anticipation of danger. Can’t shift that weight? Blame your hips also known as your "survival" muscle.
Sitting all day causes your hips to become stuck in a forward thrust position. This leads to pulling on the lower back and decreased blood flow and circulation through the hips and to where it matters.